They met together in dark woods, which they called Sacred Groves; and there they instructed, in their mysterious arts, young men who came to them as pupils, and who sometimes stayed with them as long as twenty years.
These Druids built great Temples and altars, open to the sky, fragments of some of which are yet remaining.

Stonehenge, on Salisbury Plain, in Wiltshire, is the most extraordinary of these.

Three curious stones, called Kits Coty House, on Bluebell Hill, near Maidstone, in Kent, form another.

We know, from examination of the great blocks of which such buildings are made, that they could not have been raised without the aid of some ingenious machines, which are common now, but which the ancient Britons certainly did not use in making their own uncomfortable houses.

I should not wonder if the Druids, and their pupils who stayed with them twenty years, knowing more than the rest of the Britons, kept the people out of sight while they made these buildings, and then pretended that they built them by magic.